--- /dev/null
+<?php
+
+namespace Drupal\media;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides dynamic permissions for each media type.
+ */
+class MediaPermissions implements ContainerInjectionInterface {
+
+ use StringTranslationTrait;
+
+ /**
+ * The entity type manager service.
+ *
+ * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+ */
+ protected $entityTypeManager;
+
+ /**
+ * MediaPermissions constructor.
+ *
+ * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+ * The entity type manager service.
+ */
+ public function __construct(EntityTypeManagerInterface $entity_type_manager) {
+ $this->entityTypeManager = $entity_type_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static($container->get('entity_type.manager'));
+ }
+
+ /**
+ * Returns an array of media type permissions.
+ *
+ * @return array
+ * The media type permissions.
+ *
+ * @see \Drupal\user\PermissionHandlerInterface::getPermissions()
+ */
+ public function mediaTypePermissions() {
+ $perms = [];
+ // Generate media permissions for all media types.
+ $media_types = $this->entityTypeManager
+ ->getStorage('media_type')->loadMultiple();
+ foreach ($media_types as $type) {
+ $perms += $this->buildPermissions($type);
+ }
+ return $perms;
+ }
+
+ /**
+ * Returns a list of media permissions for a given media type.
+ *
+ * @param \Drupal\media\MediaTypeInterface $type
+ * The media type.
+ *
+ * @return array
+ * An associative array of permission names and descriptions.
+ */
+ protected function buildPermissions(MediaTypeInterface $type) {
+ $type_id = $type->id();
+ $type_params = ['%type_name' => $type->label()];
+
+ return [
+ "create $type_id media" => [
+ 'title' => $this->t('%type_name: Create new media', $type_params),
+ ],
+ "edit own $type_id media" => [
+ 'title' => $this->t('%type_name: Edit own media', $type_params),
+ ],
+ "edit any $type_id media" => [
+ 'title' => $this->t('%type_name: Edit any media', $type_params),
+ ],
+ "delete own $type_id media" => [
+ 'title' => $this->t('%type_name: Delete own media', $type_params),
+ ],
+ "delete any $type_id media" => [
+ 'title' => $this->t('%type_name: Delete any media', $type_params),
+ ],
+ ];
+ }
+
+}